doc: fix wrong date and known issue in changelog.md
doc: fix wrong date and known issue in changelog.md

* A known issue was resolved but not removed from the list
* The wrong date was documented in the changelog for v4.2.2

PR-URL: https://github.com/nodejs/node/pull/3650
Reviewed-By: Michaël Zasso <dc852f7f42c586356f6be32b8780273088b3bded@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node